Progesterone in the contraceptive pill:
Prevents ovulation
Inhibits estrogen
Checks attachment of zygote to endometrium
All the above
Ideal contraceptive should be
$I$. User-friendly
$II$. Easily available
$III$. Effective
$IV$. Interferring coitus
$V$. Expensive and effective
$A$ : Maximum chances of failure in Rhythm method of contraception.
$R$ : Very few women have absolutely regular cycles.
$Cu$ ions released from copperreleasingintrauterine devices $(IUDs)$
Condoms are made up of thin rubber/latex sheath which is used to cover
$A$ : Saheli - the new oral contraceptive for the female contains a non-steroidal preparation.
$R$ : It is 'once a week' pill with very few side effects and high contraceptive value.